6. Diamagnetic anisotropy causes the aromatic protons of benzene to be A. Shield

Question

6. Diamagnetic anisotropy causes the aromatic protons of benzene to be A. Shielded B. Deshielded D. Homotopic E. Upfield 7. Rank the 1C NMR signals of the labeled carbon atoms in terms of increasing chemical shift. A. B. C. D. A, D, C, B A, C, D, B B, C, D, A B, D, C, A The following are independent of the operating frequency of the NMR used to acquire a spectrum. 8. A. Chemical shift B. Coupling constant C. E between and spin states D. A and B E. A and C F. B and C Determine the number of expected signals in the 'H NMR spectrum of the following compounds 9.

Explanation / Answer

ans 6)   E   (upfield)

if we take benzene, there are six proton on the side of ring. if external magnetic field is applied upwards(think benzene in a plane kept horizontal) then there will be induced magnetic field, which will act downwards . Now when we see total field at proton then we observe that it is sum of applied and induced magnetic field.

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